xref: /netbsd/sys/nfs/nfs_bio.c (revision c4a72b64)
1 /*	$NetBSD: nfs_bio.c,v 1.85 2002/10/29 10:15:16 yamt Exp $	*/
2 
3 /*
4  * Copyright (c) 1989, 1993
5  *	The Regents of the University of California.  All rights reserved.
6  *
7  * This code is derived from software contributed to Berkeley by
8  * Rick Macklem at The University of Guelph.
9  *
10  * Redistribution and use in source and binary forms, with or without
11  * modification, are permitted provided that the following conditions
12  * are met:
13  * 1. Redistributions of source code must retain the above copyright
14  *    notice, this list of conditions and the following disclaimer.
15  * 2. Redistributions in binary form must reproduce the above copyright
16  *    notice, this list of conditions and the following disclaimer in the
17  *    documentation and/or other materials provided with the distribution.
18  * 3. All advertising materials mentioning features or use of this software
19  *    must display the following acknowledgement:
20  *	This product includes software developed by the University of
21  *	California, Berkeley and its contributors.
22  * 4. Neither the name of the University nor the names of its contributors
23  *    may be used to endorse or promote products derived from this software
24  *    without specific prior written permission.
25  *
26  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
27  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
28  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
29  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
30  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
31  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
32  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
33  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
34  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
35  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
36  * SUCH DAMAGE.
37  *
38  *	@(#)nfs_bio.c	8.9 (Berkeley) 3/30/95
39  */
40 
41 #include <sys/cdefs.h>
42 __KERNEL_RCSID(0, "$NetBSD: nfs_bio.c,v 1.85 2002/10/29 10:15:16 yamt Exp $");
43 
44 #include "opt_nfs.h"
45 #include "opt_ddb.h"
46 
47 #include <sys/param.h>
48 #include <sys/systm.h>
49 #include <sys/resourcevar.h>
50 #include <sys/signalvar.h>
51 #include <sys/proc.h>
52 #include <sys/buf.h>
53 #include <sys/vnode.h>
54 #include <sys/mount.h>
55 #include <sys/kernel.h>
56 #include <sys/namei.h>
57 #include <sys/dirent.h>
58 #include <sys/malloc.h>
59 
60 #include <uvm/uvm_extern.h>
61 #include <uvm/uvm.h>
62 
63 #include <nfs/rpcv2.h>
64 #include <nfs/nfsproto.h>
65 #include <nfs/nfs.h>
66 #include <nfs/nfsmount.h>
67 #include <nfs/nqnfs.h>
68 #include <nfs/nfsnode.h>
69 #include <nfs/nfs_var.h>
70 
71 extern int nfs_numasync;
72 extern int nfs_commitsize;
73 extern struct nfsstats nfsstats;
74 
75 /*
76  * Vnode op for read using bio
77  * Any similarity to readip() is purely coincidental
78  */
79 int
80 nfs_bioread(vp, uio, ioflag, cred, cflag)
81 	struct vnode *vp;
82 	struct uio *uio;
83 	int ioflag, cflag;
84 	struct ucred *cred;
85 {
86 	struct nfsnode *np = VTONFS(vp);
87 	struct buf *bp = NULL, *rabp;
88 	struct vattr vattr;
89 	struct proc *p;
90 	struct nfsmount *nmp = VFSTONFS(vp->v_mount);
91 	struct nfsdircache *ndp = NULL, *nndp = NULL;
92 	caddr_t baddr, ep, edp;
93 	int got_buf = 0, error = 0, n = 0, on = 0, en, enn;
94 	int enough = 0;
95 	struct dirent *dp, *pdp;
96 	off_t curoff = 0;
97 
98 #ifdef DIAGNOSTIC
99 	if (uio->uio_rw != UIO_READ)
100 		panic("nfs_read mode");
101 #endif
102 	if (uio->uio_resid == 0)
103 		return (0);
104 	if (vp->v_type != VDIR && uio->uio_offset < 0)
105 		return (EINVAL);
106 	p = uio->uio_procp;
107 #ifndef NFS_V2_ONLY
108 	if ((nmp->nm_flag & NFSMNT_NFSV3) &&
109 	    !(nmp->nm_iflag & NFSMNT_GOTFSINFO))
110 		(void)nfs_fsinfo(nmp, vp, cred, p);
111 #endif
112 	if (vp->v_type != VDIR &&
113 	    (uio->uio_offset + uio->uio_resid) > nmp->nm_maxfilesize)
114 		return (EFBIG);
115 
116 	/*
117 	 * For nfs, cache consistency can only be maintained approximately.
118 	 * Although RFC1094 does not specify the criteria, the following is
119 	 * believed to be compatible with the reference port.
120 	 * For nqnfs, full cache consistency is maintained within the loop.
121 	 * For nfs:
122 	 * If the file's modify time on the server has changed since the
123 	 * last read rpc or you have written to the file,
124 	 * you may have lost data cache consistency with the
125 	 * server, so flush all of the file's data out of the cache.
126 	 * Then force a getattr rpc to ensure that you have up to date
127 	 * attributes.
128 	 * NB: This implies that cache data can be read when up to
129 	 * NFS_ATTRTIMEO seconds out of date. If you find that you need current
130 	 * attributes this could be forced by setting n_attrstamp to 0 before
131 	 * the VOP_GETATTR() call.
132 	 */
133 
134 	if ((nmp->nm_flag & NFSMNT_NQNFS) == 0 && vp->v_type != VLNK) {
135 		if (np->n_flag & NMODIFIED) {
136 			if (vp->v_type != VREG) {
137 				if (vp->v_type != VDIR)
138 					panic("nfs: bioread, not dir");
139 				nfs_invaldircache(vp, 0);
140 				np->n_direofoffset = 0;
141 				error = nfs_vinvalbuf(vp, V_SAVE, cred, p, 1);
142 				if (error)
143 					return (error);
144 			}
145 			np->n_attrstamp = 0;
146 			error = VOP_GETATTR(vp, &vattr, cred, p);
147 			if (error)
148 				return (error);
149 			np->n_mtime = vattr.va_mtime.tv_sec;
150 		} else {
151 			error = VOP_GETATTR(vp, &vattr, cred, p);
152 			if (error)
153 				return (error);
154 			if (np->n_mtime != vattr.va_mtime.tv_sec) {
155 				if (vp->v_type == VDIR) {
156 					nfs_invaldircache(vp, 0);
157 					np->n_direofoffset = 0;
158 				}
159 				error = nfs_vinvalbuf(vp, V_SAVE, cred, p, 1);
160 				if (error)
161 					return (error);
162 				np->n_mtime = vattr.va_mtime.tv_sec;
163 			}
164 		}
165 	}
166 
167 	/*
168 	 * update the cached read creds for this node.
169 	 */
170 
171 	if (np->n_rcred) {
172 		crfree(np->n_rcred);
173 	}
174 	np->n_rcred = cred;
175 	crhold(cred);
176 
177 	do {
178 #ifndef NFS_V2_ONLY
179 	    /*
180 	     * Get a valid lease. If cached data is stale, flush it.
181 	     */
182 	    if (nmp->nm_flag & NFSMNT_NQNFS) {
183 		if (NQNFS_CKINVALID(vp, np, ND_READ)) {
184 		    do {
185 			error = nqnfs_getlease(vp, ND_READ, cred, p);
186 		    } while (error == NQNFS_EXPIRED);
187 		    if (error)
188 			return (error);
189 		    if (np->n_lrev != np->n_brev ||
190 			(np->n_flag & NQNFSNONCACHE) ||
191 			((np->n_flag & NMODIFIED) && vp->v_type == VDIR)) {
192 			if (vp->v_type == VDIR) {
193 				nfs_invaldircache(vp, 0);
194 				np->n_direofoffset = 0;
195 			}
196 			error = nfs_vinvalbuf(vp, V_SAVE, cred, p, 1);
197 			if (error)
198 			    return (error);
199 			np->n_brev = np->n_lrev;
200 		    }
201 		} else if (vp->v_type == VDIR && (np->n_flag & NMODIFIED)) {
202 		    nfs_invaldircache(vp, 0);
203 		    error = nfs_vinvalbuf(vp, V_SAVE, cred, p, 1);
204 		    np->n_direofoffset = 0;
205 		    if (error)
206 			return (error);
207 		}
208 	    }
209 #endif
210 	    /*
211 	     * Don't cache symlinks.
212 	     */
213 	    if (np->n_flag & NQNFSNONCACHE
214 		|| ((vp->v_flag & VROOT) && vp->v_type == VLNK)) {
215 		switch (vp->v_type) {
216 		case VREG:
217 			return (nfs_readrpc(vp, uio));
218 		case VLNK:
219 			return (nfs_readlinkrpc(vp, uio, cred));
220 		case VDIR:
221 			break;
222 		default:
223 			printf(" NQNFSNONCACHE: type %x unexpected\n",
224 			    vp->v_type);
225 		};
226 	    }
227 	    baddr = (caddr_t)0;
228 	    switch (vp->v_type) {
229 	    case VREG:
230 		nfsstats.biocache_reads++;
231 
232 		error = 0;
233 		if (uio->uio_offset >= np->n_size) {
234 			break;
235 		}
236 		while (uio->uio_resid > 0) {
237 			void *win;
238 			vsize_t bytelen = MIN(np->n_size - uio->uio_offset,
239 					      uio->uio_resid);
240 
241 			if (bytelen == 0)
242 				break;
243 			win = ubc_alloc(&vp->v_uobj, uio->uio_offset,
244 					&bytelen, UBC_READ);
245 			error = uiomove(win, bytelen, uio);
246 			ubc_release(win, 0);
247 			if (error) {
248 				break;
249 			}
250 		}
251 		n = 0;
252 		break;
253 
254 	    case VLNK:
255 		nfsstats.biocache_readlinks++;
256 		bp = nfs_getcacheblk(vp, (daddr_t)0, NFS_MAXPATHLEN, p);
257 		if (!bp)
258 			return (EINTR);
259 		if ((bp->b_flags & B_DONE) == 0) {
260 			bp->b_flags |= B_READ;
261 			error = nfs_doio(bp, p);
262 			if (error) {
263 				brelse(bp);
264 				return (error);
265 			}
266 		}
267 		n = MIN(uio->uio_resid, NFS_MAXPATHLEN - bp->b_resid);
268 		got_buf = 1;
269 		on = 0;
270 		break;
271 	    case VDIR:
272 diragain:
273 		nfsstats.biocache_readdirs++;
274 		ndp = nfs_searchdircache(vp, uio->uio_offset,
275 			(nmp->nm_flag & NFSMNT_XLATECOOKIE), 0);
276 		if (!ndp) {
277 			/*
278 			 * We've been handed a cookie that is not
279 			 * in the cache. If we're not translating
280 			 * 32 <-> 64, it may be a value that was
281 			 * flushed out of the cache because it grew
282 			 * too big. Let the server judge if it's
283 			 * valid or not. In the translation case,
284 			 * we have no way of validating this value,
285 			 * so punt.
286 			 */
287 			if (nmp->nm_flag & NFSMNT_XLATECOOKIE)
288 				return (EINVAL);
289 			ndp = nfs_enterdircache(vp, uio->uio_offset,
290 				uio->uio_offset, 0, 0);
291 		}
292 
293 		if (uio->uio_offset != 0 &&
294 		    ndp->dc_cookie == np->n_direofoffset) {
295 			nfsstats.direofcache_hits++;
296 			return (0);
297 		}
298 
299 		bp = nfs_getcacheblk(vp, ndp->dc_blkno, NFS_DIRBLKSIZ, p);
300 		if (!bp)
301 		    return (EINTR);
302 		if ((bp->b_flags & B_DONE) == 0) {
303 		    bp->b_flags |= B_READ;
304 		    bp->b_dcookie = ndp->dc_blkcookie;
305 		    error = nfs_doio(bp, p);
306 		    if (error) {
307 			/*
308 			 * Yuck! The directory has been modified on the
309 			 * server. Punt and let the userland code
310 			 * deal with it.
311 			 */
312 			brelse(bp);
313 			if (error == NFSERR_BAD_COOKIE) {
314 			    nfs_invaldircache(vp, 0);
315 			    nfs_vinvalbuf(vp, 0, cred, p, 1);
316 			    error = EINVAL;
317 			}
318 			return (error);
319 		    }
320 		}
321 
322 		/*
323 		 * Just return if we hit EOF right away with this
324 		 * block. Always check here, because direofoffset
325 		 * may have been set by an nfsiod since the last
326 		 * check.
327 		 */
328 		if (np->n_direofoffset != 0 &&
329 			ndp->dc_blkcookie == np->n_direofoffset) {
330 			brelse(bp);
331 			return (0);
332 		}
333 
334 		/*
335 		 * Find the entry we were looking for in the block.
336 		 */
337 
338 		en = ndp->dc_entry;
339 
340 		pdp = dp = (struct dirent *)bp->b_data;
341 		edp = bp->b_data + bp->b_bcount - bp->b_resid;
342 		enn = 0;
343 		while (enn < en && (caddr_t)dp < edp) {
344 			pdp = dp;
345 			dp = (struct dirent *)((caddr_t)dp + dp->d_reclen);
346 			enn++;
347 		}
348 
349 		/*
350 		 * If the entry number was bigger than the number of
351 		 * entries in the block, or the cookie of the previous
352 		 * entry doesn't match, the directory cache is
353 		 * stale. Flush it and try again (i.e. go to
354 		 * the server).
355 		 */
356 		if ((caddr_t)dp >= edp || (caddr_t)dp + dp->d_reclen > edp ||
357 		    (en > 0 && NFS_GETCOOKIE(pdp) != ndp->dc_cookie)) {
358 #ifdef DEBUG
359 		    	printf("invalid cache: %p %p %p off %lx %lx\n",
360 				pdp, dp, edp,
361 				(unsigned long)uio->uio_offset,
362 				(unsigned long)NFS_GETCOOKIE(pdp));
363 #endif
364 			brelse(bp);
365 			nfs_invaldircache(vp, 0);
366 			nfs_vinvalbuf(vp, 0, cred, p, 0);
367 			goto diragain;
368 		}
369 
370 		on = (caddr_t)dp - bp->b_data;
371 
372 		/*
373 		 * Cache all entries that may be exported to the
374 		 * user, as they may be thrown back at us. The
375 		 * NFSBIO_CACHECOOKIES flag indicates that all
376 		 * entries are being 'exported', so cache them all.
377 		 */
378 
379 		if (en == 0 && pdp == dp) {
380 			dp = (struct dirent *)
381 			    ((caddr_t)dp + dp->d_reclen);
382 			enn++;
383 		}
384 
385 		if (uio->uio_resid < (bp->b_bcount - bp->b_resid - on)) {
386 			n = uio->uio_resid;
387 			enough = 1;
388 		} else
389 			n = bp->b_bcount - bp->b_resid - on;
390 
391 		ep = bp->b_data + on + n;
392 
393 		/*
394 		 * Find last complete entry to copy, caching entries
395 		 * (if requested) as we go.
396 		 */
397 
398 		while ((caddr_t)dp < ep && (caddr_t)dp + dp->d_reclen <= ep) {
399 			if (cflag & NFSBIO_CACHECOOKIES) {
400 				nndp = nfs_enterdircache(vp, NFS_GETCOOKIE(pdp),
401 				    ndp->dc_blkcookie, enn, bp->b_lblkno);
402 				if (nmp->nm_flag & NFSMNT_XLATECOOKIE) {
403 					NFS_STASHCOOKIE32(pdp,
404 					    nndp->dc_cookie32);
405 				}
406 			}
407 			pdp = dp;
408 			dp = (struct dirent *)((caddr_t)dp + dp->d_reclen);
409 			enn++;
410 		}
411 
412 		/*
413 		 * If the last requested entry was not the last in the
414 		 * buffer (happens if NFS_DIRFRAGSIZ < NFS_DIRBLKSIZ),
415 		 * cache the cookie of the last requested one, and
416 		 * set of the offset to it.
417 		 */
418 
419 		if ((on + n) < bp->b_bcount - bp->b_resid) {
420 			curoff = NFS_GETCOOKIE(pdp);
421 			nndp = nfs_enterdircache(vp, curoff, ndp->dc_blkcookie,
422 			    enn, bp->b_lblkno);
423 			if (nmp->nm_flag & NFSMNT_XLATECOOKIE) {
424 				NFS_STASHCOOKIE32(pdp, nndp->dc_cookie32);
425 				curoff = nndp->dc_cookie32;
426 			}
427 		} else
428 			curoff = bp->b_dcookie;
429 
430 		/*
431 		 * Always cache the entry for the next block,
432 		 * so that readaheads can use it.
433 		 */
434 		nndp = nfs_enterdircache(vp, bp->b_dcookie, bp->b_dcookie, 0,0);
435 		if (nmp->nm_flag & NFSMNT_XLATECOOKIE) {
436 			if (curoff == bp->b_dcookie) {
437 				NFS_STASHCOOKIE32(pdp, nndp->dc_cookie32);
438 				curoff = nndp->dc_cookie32;
439 			}
440 		}
441 
442 		n = ((caddr_t)pdp + pdp->d_reclen) - (bp->b_data + on);
443 
444 		/*
445 		 * If not eof and read aheads are enabled, start one.
446 		 * (You need the current block first, so that you have the
447 		 *  directory offset cookie of the next block.)
448 		 */
449 		if (nfs_numasync > 0 && nmp->nm_readahead > 0 &&
450 		    np->n_direofoffset == 0 && !(np->n_flag & NQNFSNONCACHE)) {
451 			rabp = nfs_getcacheblk(vp, nndp->dc_blkno,
452 						NFS_DIRBLKSIZ, p);
453 			if (rabp) {
454 			    if ((rabp->b_flags & (B_DONE | B_DELWRI)) == 0) {
455 				rabp->b_dcookie = nndp->dc_cookie;
456 				rabp->b_flags |= (B_READ | B_ASYNC);
457 				if (nfs_asyncio(rabp)) {
458 				    rabp->b_flags |= B_INVAL;
459 				    brelse(rabp);
460 				}
461 			    } else
462 				brelse(rabp);
463 			}
464 		}
465 		got_buf = 1;
466 		break;
467 	    default:
468 		printf(" nfsbioread: type %x unexpected\n",vp->v_type);
469 		break;
470 	    }
471 
472 	    if (n > 0) {
473 		if (!baddr)
474 			baddr = bp->b_data;
475 		error = uiomove(baddr + on, (int)n, uio);
476 	    }
477 	    switch (vp->v_type) {
478 	    case VREG:
479 		break;
480 	    case VLNK:
481 		n = 0;
482 		break;
483 	    case VDIR:
484 		if (np->n_flag & NQNFSNONCACHE)
485 			bp->b_flags |= B_INVAL;
486 		uio->uio_offset = curoff;
487 		if (enough)
488 			n = 0;
489 		break;
490 	    default:
491 		printf(" nfsbioread: type %x unexpected\n",vp->v_type);
492 	    }
493 	    if (got_buf)
494 		brelse(bp);
495 	} while (error == 0 && uio->uio_resid > 0 && n > 0);
496 	return (error);
497 }
498 
499 /*
500  * Vnode op for write using bio
501  */
502 int
503 nfs_write(v)
504 	void *v;
505 {
506 	struct vop_write_args /* {
507 		struct vnode *a_vp;
508 		struct uio *a_uio;
509 		int  a_ioflag;
510 		struct ucred *a_cred;
511 	} */ *ap = v;
512 	struct uio *uio = ap->a_uio;
513 	struct proc *p = uio->uio_procp;
514 	struct vnode *vp = ap->a_vp;
515 	struct nfsnode *np = VTONFS(vp);
516 	struct ucred *cred = ap->a_cred;
517 	int ioflag = ap->a_ioflag;
518 	struct vattr vattr;
519 	struct nfsmount *nmp = VFSTONFS(vp->v_mount);
520 	void *win;
521 	voff_t oldoff, origoff;
522 	vsize_t bytelen;
523 	int error = 0, iomode, must_commit;
524 	int extended = 0, wrotedta = 0;
525 
526 #ifdef DIAGNOSTIC
527 	if (uio->uio_rw != UIO_WRITE)
528 		panic("nfs_write mode");
529 	if (uio->uio_segflg == UIO_USERSPACE && uio->uio_procp != curproc)
530 		panic("nfs_write proc");
531 #endif
532 	if (vp->v_type != VREG)
533 		return (EIO);
534 	if (np->n_flag & NWRITEERR) {
535 		np->n_flag &= ~NWRITEERR;
536 		return (np->n_error);
537 	}
538 #ifndef NFS_V2_ONLY
539 	if ((nmp->nm_flag & NFSMNT_NFSV3) &&
540 	    !(nmp->nm_iflag & NFSMNT_GOTFSINFO))
541 		(void)nfs_fsinfo(nmp, vp, cred, p);
542 #endif
543 	if (ioflag & (IO_APPEND | IO_SYNC)) {
544 		if (np->n_flag & NMODIFIED) {
545 			np->n_attrstamp = 0;
546 			error = nfs_vinvalbuf(vp, V_SAVE, cred, p, 1);
547 			if (error)
548 				return (error);
549 		}
550 		if (ioflag & IO_APPEND) {
551 			np->n_attrstamp = 0;
552 			error = VOP_GETATTR(vp, &vattr, cred, p);
553 			if (error)
554 				return (error);
555 			uio->uio_offset = np->n_size;
556 		}
557 	}
558 	if (uio->uio_offset < 0)
559 		return (EINVAL);
560 	if ((uio->uio_offset + uio->uio_resid) > nmp->nm_maxfilesize)
561 		return (EFBIG);
562 	if (uio->uio_resid == 0)
563 		return (0);
564 	/*
565 	 * Maybe this should be above the vnode op call, but so long as
566 	 * file servers have no limits, i don't think it matters
567 	 */
568 	if (p && uio->uio_offset + uio->uio_resid >
569 	      p->p_rlimit[RLIMIT_FSIZE].rlim_cur) {
570 		psignal(p, SIGXFSZ);
571 		return (EFBIG);
572 	}
573 
574 	/*
575 	 * update the cached write creds for this node.
576 	 */
577 
578 	if (np->n_wcred) {
579 		crfree(np->n_wcred);
580 	}
581 	np->n_wcred = cred;
582 	crhold(cred);
583 
584 	if ((np->n_flag & NQNFSNONCACHE) && uio->uio_iovcnt == 1) {
585 		iomode = NFSV3WRITE_FILESYNC;
586 		error = nfs_writerpc(vp, uio, &iomode, &must_commit);
587 		if (must_commit)
588 			nfs_clearcommit(vp->v_mount);
589 		return (error);
590 	}
591 
592 	origoff = uio->uio_offset;
593 	do {
594 		boolean_t extending; /* if we are extending whole pages */
595 		u_quad_t oldsize;
596 		oldoff = uio->uio_offset;
597 		bytelen = uio->uio_resid;
598 
599 #ifndef NFS_V2_ONLY
600 		/*
601 		 * Check for a valid write lease.
602 		 */
603 		if ((nmp->nm_flag & NFSMNT_NQNFS) &&
604 		    NQNFS_CKINVALID(vp, np, ND_WRITE)) {
605 			do {
606 				error = nqnfs_getlease(vp, ND_WRITE, cred, p);
607 			} while (error == NQNFS_EXPIRED);
608 			if (error)
609 				return (error);
610 			if (np->n_lrev != np->n_brev ||
611 			    (np->n_flag & NQNFSNONCACHE)) {
612 				error = nfs_vinvalbuf(vp, V_SAVE, cred, p, 1);
613 				if (error)
614 					return (error);
615 				np->n_brev = np->n_lrev;
616 			}
617 		}
618 #endif
619 		nfsstats.biocache_writes++;
620 
621 		oldsize = np->n_size;
622 		np->n_flag |= NMODIFIED;
623 		if (np->n_size < uio->uio_offset + bytelen) {
624 			np->n_size = uio->uio_offset + bytelen;
625 		}
626 		extending = ((uio->uio_offset & PAGE_MASK) == 0 &&
627 		    (bytelen & PAGE_MASK) == 0 &&
628 		    uio->uio_offset >= vp->v_size);
629 		if (extending) {
630 			win = ubc_alloc(&vp->v_uobj, uio->uio_offset, &bytelen,
631 			    UBC_WRITE | UBC_FAULTBUSY);
632 		} else {
633 			win = ubc_alloc(&vp->v_uobj, uio->uio_offset, &bytelen,
634 			    UBC_WRITE);
635 		}
636 		error = uiomove(win, bytelen, uio);
637 		ubc_release(win, 0);
638 		if (error) {
639 			if (extending) {
640 				/*
641 				 * backout size and free pages past eof.
642 				 */
643 				np->n_size = oldsize;
644 				(void)VOP_PUTPAGES(vp, round_page(vp->v_size),
645 				    0, PGO_SYNCIO | PGO_FREE);
646 			}
647 			break;
648 		}
649 		wrotedta = 1;
650 
651 		/*
652 		 * update UVM's notion of the size now that we've
653 		 * copied the data into the vnode's pages.
654 		 */
655 
656 		if (vp->v_size < uio->uio_offset) {
657 			uvm_vnp_setsize(vp, uio->uio_offset);
658 			extended = 1;
659 		}
660 
661 		if ((oldoff & ~(nmp->nm_wsize - 1)) !=
662 		    (uio->uio_offset & ~(nmp->nm_wsize - 1))) {
663 			simple_lock(&vp->v_interlock);
664 			error = VOP_PUTPAGES(vp,
665 			    trunc_page(oldoff & ~(nmp->nm_wsize - 1)),
666 			    round_page((uio->uio_offset + nmp->nm_wsize - 1) &
667 				       ~(nmp->nm_wsize - 1)), PGO_CLEANIT);
668 		}
669 	} while (uio->uio_resid > 0);
670 	if (wrotedta)
671 		VN_KNOTE(vp, NOTE_WRITE | (extended ? NOTE_EXTEND : 0));
672 	if ((np->n_flag & NQNFSNONCACHE) || (ioflag & IO_SYNC)) {
673 		simple_lock(&vp->v_interlock);
674 		error = VOP_PUTPAGES(vp,
675 		    trunc_page(origoff & ~(nmp->nm_wsize - 1)),
676 		    round_page((uio->uio_offset + nmp->nm_wsize - 1) &
677 			       ~(nmp->nm_wsize - 1)),
678 		    PGO_CLEANIT | PGO_SYNCIO);
679 	}
680 	return error;
681 }
682 
683 /*
684  * Get an nfs cache block.
685  * Allocate a new one if the block isn't currently in the cache
686  * and return the block marked busy. If the calling process is
687  * interrupted by a signal for an interruptible mount point, return
688  * NULL.
689  */
690 struct buf *
691 nfs_getcacheblk(vp, bn, size, p)
692 	struct vnode *vp;
693 	daddr_t bn;
694 	int size;
695 	struct proc *p;
696 {
697 	struct buf *bp;
698 	struct nfsmount *nmp = VFSTONFS(vp->v_mount);
699 
700 	if (nmp->nm_flag & NFSMNT_INT) {
701 		bp = getblk(vp, bn, size, PCATCH, 0);
702 		while (bp == NULL) {
703 			if (nfs_sigintr(nmp, NULL, p))
704 				return (NULL);
705 			bp = getblk(vp, bn, size, 0, 2 * hz);
706 		}
707 	} else
708 		bp = getblk(vp, bn, size, 0, 0);
709 	return (bp);
710 }
711 
712 /*
713  * Flush and invalidate all dirty buffers. If another process is already
714  * doing the flush, just wait for completion.
715  */
716 int
717 nfs_vinvalbuf(vp, flags, cred, p, intrflg)
718 	struct vnode *vp;
719 	int flags;
720 	struct ucred *cred;
721 	struct proc *p;
722 	int intrflg;
723 {
724 	struct nfsnode *np = VTONFS(vp);
725 	struct nfsmount *nmp = VFSTONFS(vp->v_mount);
726 	int error = 0, slpflag, slptimeo;
727 
728 	if ((nmp->nm_flag & NFSMNT_INT) == 0)
729 		intrflg = 0;
730 	if (intrflg) {
731 		slpflag = PCATCH;
732 		slptimeo = 2 * hz;
733 	} else {
734 		slpflag = 0;
735 		slptimeo = 0;
736 	}
737 	/*
738 	 * First wait for any other process doing a flush to complete.
739 	 */
740 	while (np->n_flag & NFLUSHINPROG) {
741 		np->n_flag |= NFLUSHWANT;
742 		error = tsleep((caddr_t)&np->n_flag, PRIBIO + 2, "nfsvinval",
743 			slptimeo);
744 		if (error && intrflg && nfs_sigintr(nmp, NULL, p))
745 			return (EINTR);
746 	}
747 
748 	/*
749 	 * Now, flush as required.
750 	 */
751 	np->n_flag |= NFLUSHINPROG;
752 	error = vinvalbuf(vp, flags, cred, p, slpflag, 0);
753 	while (error) {
754 		if (intrflg && nfs_sigintr(nmp, NULL, p)) {
755 			np->n_flag &= ~NFLUSHINPROG;
756 			if (np->n_flag & NFLUSHWANT) {
757 				np->n_flag &= ~NFLUSHWANT;
758 				wakeup((caddr_t)&np->n_flag);
759 			}
760 			return (EINTR);
761 		}
762 		error = vinvalbuf(vp, flags, cred, p, 0, slptimeo);
763 	}
764 	np->n_flag &= ~(NMODIFIED | NFLUSHINPROG);
765 	if (np->n_flag & NFLUSHWANT) {
766 		np->n_flag &= ~NFLUSHWANT;
767 		wakeup((caddr_t)&np->n_flag);
768 	}
769 	return (0);
770 }
771 
772 /*
773  * Initiate asynchronous I/O. Return an error if no nfsiods are available.
774  * This is mainly to avoid queueing async I/O requests when the nfsiods
775  * are all hung on a dead server.
776  */
777 
778 int
779 nfs_asyncio(bp)
780 	struct buf *bp;
781 {
782 	int i;
783 	struct nfsmount *nmp;
784 	int gotiod, slpflag = 0, slptimeo = 0, error;
785 
786 	if (nfs_numasync == 0)
787 		return (EIO);
788 
789 	nmp = VFSTONFS(bp->b_vp->v_mount);
790 again:
791 	if (nmp->nm_flag & NFSMNT_INT)
792 		slpflag = PCATCH;
793 	gotiod = FALSE;
794 
795 	/*
796 	 * Find a free iod to process this request.
797 	 */
798 
799 	for (i = 0; i < NFS_MAXASYNCDAEMON; i++)
800 		if (nfs_iodwant[i]) {
801 			/*
802 			 * Found one, so wake it up and tell it which
803 			 * mount to process.
804 			 */
805 			nfs_iodwant[i] = NULL;
806 			nfs_iodmount[i] = nmp;
807 			nmp->nm_bufqiods++;
808 			wakeup((caddr_t)&nfs_iodwant[i]);
809 			gotiod = TRUE;
810 			break;
811 		}
812 
813 	/*
814 	 * If none are free, we may already have an iod working on this mount
815 	 * point.  If so, it will process our request.
816 	 */
817 
818 	if (!gotiod && nmp->nm_bufqiods > 0)
819 		gotiod = TRUE;
820 
821 	/*
822 	 * If we have an iod which can process the request, then queue
823 	 * the buffer.
824 	 */
825 
826 	if (gotiod) {
827 
828 		/*
829 		 * Ensure that the queue never grows too large.
830 		 */
831 
832 		while (nmp->nm_bufqlen >= 2*nfs_numasync) {
833 			nmp->nm_bufqwant = TRUE;
834 			error = tsleep(&nmp->nm_bufq, slpflag | PRIBIO,
835 				"nfsaio", slptimeo);
836 			if (error) {
837 				if (nfs_sigintr(nmp, NULL, curproc))
838 					return (EINTR);
839 				if (slpflag == PCATCH) {
840 					slpflag = 0;
841 					slptimeo = 2 * hz;
842 				}
843 			}
844 
845 			/*
846 			 * We might have lost our iod while sleeping,
847 			 * so check and loop if nescessary.
848 			 */
849 
850 			if (nmp->nm_bufqiods == 0)
851 				goto again;
852 		}
853 		TAILQ_INSERT_TAIL(&nmp->nm_bufq, bp, b_freelist);
854 		nmp->nm_bufqlen++;
855 		return (0);
856 	}
857 
858 	/*
859 	 * All the iods are busy on other mounts, so return EIO to
860 	 * force the caller to process the i/o synchronously.
861 	 */
862 
863 	return (EIO);
864 }
865 
866 /*
867  * Do an I/O operation to/from a cache block. This may be called
868  * synchronously or from an nfsiod.
869  */
870 int
871 nfs_doio(bp, p)
872 	struct buf *bp;
873 	struct proc *p;
874 {
875 	struct uio *uiop;
876 	struct vnode *vp;
877 	struct nfsnode *np;
878 	struct nfsmount *nmp;
879 	int error = 0, diff, len, iomode, must_commit = 0;
880 	int pushedrange;
881 	struct uio uio;
882 	struct iovec io;
883 	off_t off, cnt;
884 	struct uvm_object *uobj;
885 	UVMHIST_FUNC("nfs_doio"); UVMHIST_CALLED(ubchist);
886 
887 	vp = bp->b_vp;
888 	uobj = &vp->v_uobj;
889 	np = VTONFS(vp);
890 	nmp = VFSTONFS(vp->v_mount);
891 	uiop = &uio;
892 	uiop->uio_iov = &io;
893 	uiop->uio_iovcnt = 1;
894 	uiop->uio_segflg = UIO_SYSSPACE;
895 	uiop->uio_procp = p;
896 
897 	/*
898 	 * Historically, paging was done with physio, but no more...
899 	 */
900 	if (bp->b_flags & B_PHYS) {
901 	    /*
902 	     * ...though reading /dev/drum still gets us here.
903 	     */
904 	    io.iov_len = uiop->uio_resid = bp->b_bcount;
905 	    /* mapping was done by vmapbuf() */
906 	    io.iov_base = bp->b_data;
907 	    uiop->uio_offset = ((off_t)bp->b_blkno) << DEV_BSHIFT;
908 	    if (bp->b_flags & B_READ) {
909 		uiop->uio_rw = UIO_READ;
910 		nfsstats.read_physios++;
911 		error = nfs_readrpc(vp, uiop);
912 	    } else {
913 		iomode = NFSV3WRITE_DATASYNC;
914 		uiop->uio_rw = UIO_WRITE;
915 		nfsstats.write_physios++;
916 		error = nfs_writerpc(vp, uiop, &iomode, &must_commit);
917 	    }
918 	    if (error) {
919 		bp->b_flags |= B_ERROR;
920 		bp->b_error = error;
921 	    }
922 	} else if (bp->b_flags & B_READ) {
923 	    io.iov_len = uiop->uio_resid = bp->b_bcount;
924 	    io.iov_base = bp->b_data;
925 	    uiop->uio_rw = UIO_READ;
926 	    switch (vp->v_type) {
927 	    case VREG:
928 		uiop->uio_offset = ((off_t)bp->b_blkno) << DEV_BSHIFT;
929 		nfsstats.read_bios++;
930 		error = nfs_readrpc(vp, uiop);
931 		if (!error && uiop->uio_resid) {
932 
933 			/*
934 			 * If len > 0, there is a hole in the file and
935 			 * no writes after the hole have been pushed to
936 			 * the server yet.
937 			 * Just zero fill the rest of the valid area.
938 			 */
939 
940 			diff = bp->b_bcount - uiop->uio_resid;
941 			len = np->n_size - ((((off_t)bp->b_blkno) << DEV_BSHIFT)
942 				+ diff);
943 			if (len > 0) {
944 				len = MIN(len, uiop->uio_resid);
945 				memset((char *)bp->b_data + diff, 0, len);
946 			}
947 		}
948 		if (p && (vp->v_flag & VTEXT) &&
949 			(((nmp->nm_flag & NFSMNT_NQNFS) &&
950 			  NQNFS_CKINVALID(vp, np, ND_READ) &&
951 			  np->n_lrev != np->n_brev) ||
952 			 (!(nmp->nm_flag & NFSMNT_NQNFS) &&
953 			  np->n_mtime != np->n_vattr->va_mtime.tv_sec))) {
954 			uprintf("Process killed due to "
955 				"text file modification\n");
956 			psignal(p, SIGKILL);
957 			p->p_holdcnt++;
958 		}
959 		break;
960 	    case VLNK:
961 		uiop->uio_offset = (off_t)0;
962 		nfsstats.readlink_bios++;
963 		error = nfs_readlinkrpc(vp, uiop, curproc->p_ucred);
964 		break;
965 	    case VDIR:
966 		nfsstats.readdir_bios++;
967 		uiop->uio_offset = bp->b_dcookie;
968 		if (nmp->nm_flag & NFSMNT_RDIRPLUS) {
969 			error = nfs_readdirplusrpc(vp, uiop, curproc->p_ucred);
970 			if (error == NFSERR_NOTSUPP)
971 				nmp->nm_flag &= ~NFSMNT_RDIRPLUS;
972 		}
973 		if ((nmp->nm_flag & NFSMNT_RDIRPLUS) == 0)
974 			error = nfs_readdirrpc(vp, uiop, curproc->p_ucred);
975 		if (!error) {
976 			bp->b_dcookie = uiop->uio_offset;
977 		}
978 		break;
979 	    default:
980 		printf("nfs_doio:  type %x unexpected\n",vp->v_type);
981 		break;
982 	    }
983 	    if (error) {
984 		bp->b_flags |= B_ERROR;
985 		bp->b_error = error;
986 	    }
987 	} else {
988 	    int i, npages = bp->b_bufsize >> PAGE_SHIFT;
989 	    struct vm_page *pgs[npages];
990 	    boolean_t needcommit = TRUE;
991 
992 	    if ((bp->b_flags & B_ASYNC) != 0 && NFS_ISV3(vp)) {
993 		    iomode = NFSV3WRITE_UNSTABLE;
994 	    } else {
995 		    iomode = NFSV3WRITE_FILESYNC;
996 	    }
997 
998 	    for (i = 0; i < npages; i++) {
999 		    pgs[i] = uvm_pageratop((vaddr_t)bp->b_data +
1000 					   (i << PAGE_SHIFT));
1001 		    if ((pgs[i]->flags & PG_NEEDCOMMIT) == 0) {
1002 			    needcommit = FALSE;
1003 		    }
1004 	    }
1005 	    if (!needcommit && iomode == NFSV3WRITE_UNSTABLE) {
1006 		    for (i = 0; i < npages; i++) {
1007 			    pgs[i]->flags |= PG_NEEDCOMMIT | PG_RDONLY;
1008 			    pmap_page_protect(pgs[i], VM_PROT_READ);
1009 		    }
1010 	    }
1011 
1012 	    uiop->uio_offset = (((off_t)bp->b_blkno) << DEV_BSHIFT);
1013 	    off = uiop->uio_offset;
1014 	    cnt = bp->b_bcount;
1015 
1016 	    /*
1017 	     * Send the data to the server if necessary,
1018 	     * otherwise just send a commit rpc.
1019 	     */
1020 
1021 	    if (needcommit) {
1022 
1023 		/*
1024 		 * If the buffer is in the range that we already committed,
1025 		 * there's nothing to do.
1026 		 *
1027 		 * If it's in the range that we need to commit, push the
1028 		 * whole range at once, otherwise only push the buffer.
1029 		 * In both these cases, acquire the commit lock to avoid
1030 		 * other processes modifying the range.
1031 		 */
1032 
1033 		lockmgr(&np->n_commitlock, LK_EXCLUSIVE, NULL);
1034 		if (!nfs_in_committed_range(vp, off, bp->b_bcount)) {
1035 			if (nfs_in_tobecommitted_range(vp, off, bp->b_bcount)) {
1036 				pushedrange = 1;
1037 				off = np->n_pushlo;
1038 				cnt = np->n_pushhi - np->n_pushlo;
1039 			} else {
1040 				pushedrange = 0;
1041 			}
1042 			error = nfs_commit(vp, off, cnt, curproc);
1043 			if (error == 0) {
1044 				if (pushedrange) {
1045 					nfs_merge_commit_ranges(vp);
1046 				} else {
1047 					nfs_add_committed_range(vp, off, cnt);
1048 				}
1049 			}
1050 		}
1051 		lockmgr(&np->n_commitlock, LK_RELEASE, NULL);
1052 		if (!error) {
1053 			bp->b_resid = 0;
1054 			simple_lock(&uobj->vmobjlock);
1055 			for (i = 0; i < npages; i++) {
1056 				pgs[i]->flags &= ~(PG_NEEDCOMMIT | PG_RDONLY);
1057 			}
1058 			simple_unlock(&uobj->vmobjlock);
1059 			biodone(bp);
1060 			return (0);
1061 		} else if (error == NFSERR_STALEWRITEVERF) {
1062 			nfs_clearcommit(bp->b_vp->v_mount);
1063 		}
1064 	    }
1065 	    io.iov_base = bp->b_data;
1066 	    io.iov_len = uiop->uio_resid = bp->b_bcount;
1067 	    uiop->uio_rw = UIO_WRITE;
1068 	    nfsstats.write_bios++;
1069 	    error = nfs_writerpc(vp, uiop, &iomode, &must_commit);
1070 	    if (!error && iomode == NFSV3WRITE_UNSTABLE) {
1071 		lockmgr(&np->n_commitlock, LK_EXCLUSIVE, NULL);
1072 		nfs_add_tobecommitted_range(vp, off, cnt);
1073 		simple_lock(&uobj->vmobjlock);
1074 		for (i = 0; i < npages; i++) {
1075 			pgs[i]->flags &= ~PG_CLEAN;
1076 		}
1077 		simple_unlock(&uobj->vmobjlock);
1078 		if (np->n_pushhi - np->n_pushlo > nfs_commitsize) {
1079 			off = np->n_pushlo;
1080 			cnt = nfs_commitsize >> 1;
1081 			error = nfs_commit(vp, off, cnt, curproc);
1082 			if (!error) {
1083 				nfs_add_committed_range(vp, off, cnt);
1084 				nfs_del_tobecommitted_range(vp, off, cnt);
1085 			}
1086 		}
1087 		lockmgr(&np->n_commitlock, LK_RELEASE, NULL);
1088 	    } else if (!error && needcommit) {
1089 		lockmgr(&np->n_commitlock, LK_EXCLUSIVE, NULL);
1090 		nfs_del_committed_range(vp, off, cnt);
1091 		lockmgr(&np->n_commitlock, LK_RELEASE, NULL);
1092 		simple_lock(&uobj->vmobjlock);
1093 		for (i = 0; i < npages; i++) {
1094 			pgs[i]->flags &= ~(PG_NEEDCOMMIT | PG_RDONLY);
1095 		}
1096 		simple_unlock(&uobj->vmobjlock);
1097 	    } else {
1098 		if (error) {
1099 			bp->b_flags |= B_ERROR;
1100 			bp->b_error = np->n_error = error;
1101 			np->n_flag |= NWRITEERR;
1102 		}
1103 	    }
1104 	}
1105 	bp->b_resid = uiop->uio_resid;
1106 	if (must_commit || (error == NFSERR_STALEWRITEVERF)) {
1107 		nfs_clearcommit(vp->v_mount);
1108 	}
1109 	biodone(bp);
1110 	return (error);
1111 }
1112 
1113 /*
1114  * Vnode op for VM getpages.
1115  */
1116 
1117 int
1118 nfs_getpages(v)
1119 	void *v;
1120 {
1121 	struct vop_getpages_args /* {
1122 		struct vnode *a_vp;
1123 		voff_t a_offset;
1124 		struct vm_page **a_m;
1125 		int *a_count;
1126 		int a_centeridx;
1127 		vm_prot_t a_access_type;
1128 		int a_advice;
1129 		int a_flags;
1130 	} */ *ap = v;
1131 
1132 	struct vnode *vp = ap->a_vp;
1133 	struct uvm_object *uobj = &vp->v_uobj;
1134 	struct nfsnode *np = VTONFS(vp);
1135 	const int npages = *ap->a_count;
1136 	struct vm_page *pg, **pgs, *opgs[npages];
1137 	off_t origoffset, len;
1138 	int i, error;
1139 	boolean_t v3 = NFS_ISV3(vp);
1140 	boolean_t write = (ap->a_access_type & VM_PROT_WRITE) != 0;
1141 	boolean_t locked = (ap->a_flags & PGO_LOCKED) != 0;
1142 
1143 	/*
1144 	 * update the cached read creds for this node.
1145 	 */
1146 
1147 	if (np->n_rcred) {
1148 		crfree(np->n_rcred);
1149 	}
1150 	np->n_rcred = curproc->p_ucred;
1151 	crhold(np->n_rcred);
1152 
1153 	/*
1154 	 * if we have delayed truncation and it's safe, do it now.
1155 	 */
1156 
1157 	if (ap->a_flags & PGO_SYNCIO) {
1158 		nfs_delayedtruncate(vp);
1159 	}
1160 
1161 	/*
1162 	 * call the genfs code to get the pages.  `pgs' may be NULL
1163 	 * when doing read-ahead.
1164 	 */
1165 
1166 	pgs = ap->a_m;
1167 	if (write && locked && v3) {
1168 		KASSERT(pgs != NULL);
1169 #ifdef DEBUG
1170 
1171 		/*
1172 		 * If PGO_LOCKED is set, real pages shouldn't exists
1173 		 * in the array.
1174 		 */
1175 
1176 		for (i = 0; i < npages; i++)
1177 			KDASSERT(pgs[i] == NULL || pgs[i] == PGO_DONTCARE);
1178 #endif
1179 		memcpy(opgs, pgs, npages * sizeof(struct vm_pages *));
1180 	}
1181 	error = genfs_getpages(v);
1182 	if (error) {
1183 		return (error);
1184 	}
1185 
1186 	/*
1187 	 * for read faults where the nfs node is not yet marked NMODIFIED,
1188 	 * set PG_RDONLY on the pages so that we come back here if someone
1189 	 * tries to modify later via the mapping that will be entered for
1190 	 * this fault.
1191 	 */
1192 
1193 	if (!write && (np->n_flag & NMODIFIED) == 0 && pgs != NULL) {
1194 		if (!locked) {
1195 			simple_lock(&uobj->vmobjlock);
1196 		}
1197 		for (i = 0; i < npages; i++) {
1198 			pg = pgs[i];
1199 			if (pg == NULL || pg == PGO_DONTCARE) {
1200 				continue;
1201 			}
1202 			pg->flags |= PG_RDONLY;
1203 		}
1204 		if (!locked) {
1205 			simple_unlock(&uobj->vmobjlock);
1206 		}
1207 	}
1208 	if (!write) {
1209 		return (0);
1210 	}
1211 
1212 	/*
1213 	 * this is a write fault, update the commit info.
1214 	 */
1215 
1216 	origoffset = ap->a_offset;
1217 	len = npages << PAGE_SHIFT;
1218 
1219 	if (v3) {
1220 		error = lockmgr(&np->n_commitlock,
1221 		    LK_EXCLUSIVE | (locked ? LK_NOWAIT : 0), NULL);
1222 		if (error) {
1223 			KASSERT(locked != 0);
1224 
1225 			/*
1226 			 * Since PGO_LOCKED is set, we need to unbusy
1227 			 * all pages fetched by genfs_getpages() above,
1228 			 * tell the caller that there are no pages
1229 			 * available and put back original pgs array.
1230 			 */
1231 
1232 			uvm_lock_pageq();
1233 			uvm_page_unbusy(pgs, npages);
1234 			uvm_unlock_pageq();
1235 			*ap->a_count = 0;
1236 			memcpy(pgs, opgs,
1237 			    npages * sizeof(struct vm_pages *));
1238 			return (error);
1239 		}
1240 		nfs_del_committed_range(vp, origoffset, len);
1241 		nfs_del_tobecommitted_range(vp, origoffset, len);
1242 	}
1243 	np->n_flag |= NMODIFIED;
1244 	if (!locked) {
1245 		simple_lock(&uobj->vmobjlock);
1246 	}
1247 	for (i = 0; i < npages; i++) {
1248 		pg = pgs[i];
1249 		if (pg == NULL || pg == PGO_DONTCARE) {
1250 			continue;
1251 		}
1252 		pg->flags &= ~(PG_NEEDCOMMIT | PG_RDONLY);
1253 	}
1254 	if (!locked) {
1255 		simple_unlock(&uobj->vmobjlock);
1256 	}
1257 	if (v3) {
1258 		lockmgr(&np->n_commitlock, LK_RELEASE, NULL);
1259 	}
1260 	return (0);
1261 }
1262